本文给出了三维射影空间上对合透视的代数表达式。
In this paper we discuss the algebraic expression of involutory perspective in three-dimensional projective space.
本文给出了关于二阶曲面的代数定义和射影定义之间的等价性定理。
This article is told the sense of equivalence between algebraic definition and projecting definition.
系统地研究了来自于射影几何中平面曲线运动的1 + 1维非线性方程的对称代数。
The symmetry algebras of 1 + 1 dimensional nonlinear evolution equation arising from the motion of plane curve in affine geometry are systematically studied.
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